ACETIC ACID PRODUCTION PROCESS VIA IRIDIUM-CATALYZED CARBONYLATION Russian patent published in 2005 - IPC

FIELD: industrial inorganic synthesis.

SUBSTANCE: process is accomplished by continuously feeding methanol and/or reactive derivative thereof and carbon monoxide into carbonylation reactor filled with reaction mixture containing iridium carbonylation catalyst, methyl iodide cocatalyst, water in limited concentration, acetic acid, and methyl acetate, liquid reaction mixture further including at least one promoter selected from ruthenium, osmium, rhenium, and tungsten. Carbonylation of methanol to produce acetic acid involves reaction with carbon monoxide in liquid reaction mixture. When recovering acetic acid from liquid reaction mixture, concentration of water is maintained therein not exceeding 4.5%. During reaction, partial pressure of carbon monoxide in reactor is maintained within a range between 0 and 6 bar.

EFFECT: accelerated carbonylation reaction, diminished by-product formation, and simplified acetic acid recovery operation.

6 dwg, 3 tbl